EXPIREBV processing

The following terms are referred to in the following description: date of scratch or scratch date, cataloged version, uncataloged version, active copies, and retained copies:

The date of scratch or scratch date refers to the date on which the EXPIREBV command determines that a data set for which a backup version exists has been deleted. The scratch date is generally not the date on which the data set was actually scratched, but is the date EXPIREBV was next run after the data set was scratched. The date is stored in the BCDS MCB record in the 4-byte field MCBSCRD (offset X'48', packed decimal). It can be displayed using the FIXCDS command.
Note: DFSMShsm honors a scratch date stored by the DFSMShsm space maintenance and recovery utilities if the date is newer than the most recent backup date for the data set and if EXPIREBV has not already stored the scratch date itself.
A cataloged version refers to a backup version of a data set that was cataloged when the backup version was made; that is, the data set was cataloged when it was backed up.
An uncataloged version is a version of a data set that was not cataloged when the version was made; that is, the data set was uncataloged when it was backed up.
Active copies are the set of backup copies created that have not yet rolled off.
Retained copies are the set of backup copies that have rolled off from the active copies and have not yet reached their retention periods.

Expire backup versions (EXPIREBV) processing is performed in eight steps. DFSMShsm:

Issues a starting message
Sets up the output destination
Retrieves a list of management class definitions
Determines the starting point for the scan of the BCDS
Determines the ending point for the scan of the BCDS
Processes each data set record in the BCDS between the starting and ending points
Ends the scan of the BCDS
Issues an ending message